Police say the 10-year-old boy, Jesse Wilson, is believed to have left the family home in Buckeye through an open window sometime Sunday evening, the Arizona Republicreported.

“I just miss you … your sister and your brother love you so much,” she said.

Police fanned out Wednesday throughout Buckeye and larger Maricopa County, though excessive heat forced searchers to halt operations late Thursday morning.

Summer temperatures in the area routinely reach triple digits and much of the search terrain is treacherous.

In addition to combing the land, Buckeye police have also taken to the web to ask for tips and to keep the public informed of new developments.

“An active investigation into Jesse's disappearance is ongoing and BPD will be providing updates as we get them,” the department wrote in a Facebook post Thursday. “At this time, we are asking the public to continue to keep an eye out for Jesse and share his photo with your social media friends.”

In addition to local law enforcement, the Buckeye Swat team as well as the FBI have both joined the search. On Thursday evening, FBI officials visited the Wilson home and reportedly left with bags of evidence, according to affiliate KPHO.

Well-wishers have also done their part. Wilson’s school, the Bradley Academy of Excellence, launched a hashtag campaign, #LeadJesseHome and website for donations.

Wilson is reportedly four feet tall and roughly 60 pounds. He was last seen wearing black shoes, black socks and a red shirt, the Associated Press reported.